Answered by Dmitriy Yermolaev, Credentialing Department Supervisor:

Yes. Registration certificates shall be conspicuously displayed by each licensee in each office in which the profession is practiced. In instances where licensees regularly practice at more than one professional office, registration certificates shall be obtained for each office bearing the licensee’s name and the exact address of each such office upon making a proper application to the department and submitting a fee. Where the practice is carried on in other than individual offices, each licensee shall have a current registration certificate available for inspection at all times.